From Stansted Airport train to Tottenham Hale Underground Station, Tube to London Euston, then train to Watford Junction. 1hrs 08min £35. From London Stansted bus to Stratford Underground Station, Tube to Stanmore, then line 142 bus to Watford, St Mary's Road (Unknown). 2hrs 18min £19. From Stansted Airport, Coach Station (Stansted Aprt) bus to Harlow Town Centre, Bus Station (Harlow Bus Stn) then line 724 bus to Watford, Town Hall (Unknown). 3hrs 18min £14. From London Stansted drive to Watford. 49min £10.